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Elanso [62]
3 years ago
14

Steven wants to buy a $500 bicycle. Steven has no money saved, but will be able to deposit $45 into a savings account when he re

ceives his paycheck Friday. However, before Steven can buy the bike, he must give his sister $85 that he owes her. For how many weeks will Steven need to deposit money into his saving account before he can pay back his sister and buy the bike?
Mathematics
1 answer:
zheka24 [161]3 years ago
3 0
45w = 500 + 85
45w = 585
w = 585/45
w = 13 <=== 13 weeks
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When the effective interest rate is 9% per annum, what is the present value of a series of 50 annual payments that start at $100
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Answer:

$1,109.62

Step-by-step explanation:

Let's first compute the <em>future value FV.</em>  

In order to see the rule of formation, let's see the value (in $) for the first few years

<u>End of year 0</u>

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<u>End of year 2 (capital + interest + new deposit)</u>

(1,000*(1.09)+10)*1.09 +10 =

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<u>End of year 3 (capital + interest + new deposit)</u>

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and we can see that at the end of year 50, the future value is

\bf FV=1,000*(1.09)^{50}+10(1+1.09+(1.09)^2+...+(1.09)^{49}

The sum  

\bf 1+1.09+(1.09)^2+...+(1.09)^{49}

is the <em>sum of a geometric sequence </em>with common ratio 1.09 and is equal to

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and the future value is then

\bf FV=1,000*(1.09)^{50}+10*815.08356=82,508.35564

The <em>present value PV</em> is

\bf PV=\frac{FV}{(1.09)^{50}}=\frac{82508.35564}{74.35572}=1,109.616829\approx \$1,109.62

rounded to the nearest hundredth.

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